WATCH: Judiciary chairman questions whether Comey lied to Congress

House Judiciary Committee Chairman Bob GoodlatteRobert (Bob) William GoodlatteHouse Judiciary chair threatens subpoena if DOJ doesn’t supply McCabe memos by Tuesday Rosenstein report gives GOP new ammo against DOJ House Judiciary chair: Nellie Ohr is cooperating, will testify MORE (R-Va.) told The Hill his panel will subpoena the FBI "very soon" for documents related to the conduct of former FBI Director James ComeyJames Brien ComeyRosenstein report gives GOP new ammo against DOJ Gowdy: Declassified documents unlikely to change anyone's mind on Russia investigation Pompeo on Rosenstein bombshell: Maybe you just ought to find something else to do if you can't be on the team MORE and his former deputy, Andrew McCabe. 

Goodlatte said McCabe's recent statements — made since Attorney General Jeff Sessions fired him — raised questions about Comey's prior sworn testimony to Congress where he denied authorized leaking to the press about Donald Trump or Hillary Clinton while FBI director. 

McCabe in a statement after his firing said Comey "was aware" that he had shared information with a reporter. The FBI's Office of Personnel Responsibility (OPR) cited the leak of the information in its recommendation to fire McCabe.

"I'm very concerned about it. This is a serious matter and their statements, the statement that Mr. McCabe released recently, following his firing, and Mr. Comey's sworn testimony before the Senate Judiciary Committee conflict. We don't know who's telling the truth and who's not, but that is a serious issue," Goodlatte said in an interview.

"Mr. McCabe's statement was a statement made following his firing and he was not under oath when he made that statement, but this is a clear indication that somebody wasn't telling the truth and misrepresenting to the public and to the Congress," Goodlatte added.

Under questioning from Sen. Chuck Grassley (R-Iowa), Comey in May testified that he had never authorized leaks of information on the two 2016 candidates or been an anonymous source in news stories about investigations related to them. He also said he had no knowledge of classified information about either campaign being shared with the press.

Click on the video above to hear Goodlatte in his own words.